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Riak has secondary indices, and map/reduce for ad-hoc queries. You can store raw binary data in it, and it's happy with that, but if you store JSON then it can query it. From what I can tell, the biggest difference between Riak and Bigcouch from a data model POV is that Bigcouch has materialized views, while Riak's are ad-hoc. I'm not an expert in either though...

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there you go, from the horse's mouth and fresh off the press:

"For better or worse, many people consider MongoDB and Riak to be competitors. In reality, there are very few similarities between the products."

http://seancribbs.com/tech/2011/11/07/mongodb-and-riak-in-co...

can they be used to do similar things? yes. are there overlapping use cases? indeed. Are they going to overlap more and more as time goes by and they try to expand out of their niches? absolutely.

But they fall squarely in different categories: Riak KV, MongoDB document (and HBase Column, Neo4J Graph for example)

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